Rug-making attachment for sewing machines



July 28, 1936. J. D. KARLE 2,049,395-

RUG MAKING ATTACHMENT FOR SEWING MACHINES Filed Nov. 19, 1955 2 Sheets-Sheet 1 July 28, 1936. J. D. KARLE RUG MAKING ATTACHMENT FOR SEWING MACHINES Filed Nov. 19, 1935 2 Sheets-Sheet 2 clbhn D. Earle Ma as, W W

Patented July 28, 1936 UNITED s'rArs PATENT QFFICE RUG-MAKING ATTACHMENT FOR SEWING MACHINES Application November 19, 1935, Serial No. 50,511

14 Claims. (01. 112-101) This invention relates to sewing machine attachments for forming and presenting loops of a strand of'yarn or the like to the needle of a sewing machine which stitches the looped strand to a base fabric in the production of rugs and various decorative effects. a The invention aims to improve the rug-making attachment forming the subject of U. S.

patent application of Heinrich Perkons, Serial I evenly spaced relationship by an unskilled operator.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings, of a preferred embodimentof the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the accompanying drawings, Fig. 1 is a front elevation of a rug-making attachment embodying the invention and applied to a conventional sewing machine; the yarn-laying member being shown at one extreme position of its oscillatory movement. Fig. 2 is a similar view showing the oscillatory yarn-laying member at its other extreme position. Figs. 3 and 4 are left side elevations of the device with the parts in the positions of Figs. 1 and 2. respectively. Fig. 5 is a bottom plan view of the attachment. Fig. '6 is aperspective view of a yarn tensioning spring carried by the yarn-laying member. Fig.6 is

a detail view of the yarn-tensioning device. Figs. 7 and 8 are horizontal sectional views showing the looping action of the yarn-laying member in cooperation with the sewing machine needle and loop-detaining finger spaced laterally of such needle. Fig. 9 is a top plan view of the attachment. Fig. 10 is a perspective view of the pivoted followerpiece which slidably engages the horizontalactuating pin on the needle-bar. Fig. 11 is a fragmentary rear elevation of the driving connection between the needle-bar and the oscillatory yarn-laying member. Fig. 12 is a rear elevation of the attachment. 7 Fig. 13 is a section through the shank of the loop-detaining finger takenon the line l3--l3, Fig. 1. Fig. 14 is a section on theline I 4.! 4, Fig. 12. Fig. 15 is a plan view of a portion of a rug formed by use of the attachment and Fig. 16 is a section of the rug shown in Fig. 15.

The sewing machine to which the invention is applied is conventional and comprises the reciprocatory needle 1, needle-bar 2, presser-bar 3, 5 throat-plate and feed-dog 5.

The attachment is constructed with a foot portion 6 having a shank l attachable to the sewing machine presser-bar 3 by means of the conventional presser-foot fastening screw 8. The 10 foot portion 6 is upturned at its forward free end to form the post 9 having a lateral extension 9'. Secured to the post 9 by screws [0 is the shank l I of the tread member l2 having a lower work-engaging face l3 and a guard-flange l5 M at one side of and at an elevation above the plane of the face [3; the guard-flange having an opening l5 therein. The foot 6 has a needleaperture 16, Fig. 5, and the tread-member I2 is formed with the rearwardly opening stitch-receiving slot ll.

There is secured to the forward face of the tread-shank II, by means of the screw and slot expedient IS, the laterally adjustable'shank IQ of a guide-member 20 having a work-guiding edge 2| rounded at 22.

The post 9 carries at its upper end the internally threaded fulcrum stud 23. Fig. 14, on which is journaled between the spacing washer 24 and spring-washer 25 the cross-bar 26 of the open segmental yarn-laying member 21 formed with the yarn-delivery aperture 28 and carrying the self-threading yarn-tensioning leaf-spring 29 and the yarn-receiving guide 30. A screw 23' holds the parts 24, 25 and 26 on the pivot-stud 23. The yarn-tensioning spring is fastened to the segmental member 21 by means of the screw 3| and its tension on the yarn strand is adjusted by the tension-adjusting screw 32; it being understood that the shank portion of the spring 29 is clamped tightly to the yarn-laying member 27 by the screw 31 and is sprung away from the yarn-laying member in the region of the tension adjusting screw 32, as shown in Fig. 6

The segmental member 2! works in the space between the foot 6 and the tread member I2 in the point 4| of the finger 40.

yarn-laying member 21. The follower member 31 has at its upper end a stop-finger 39 which overlies the edge of the cross-bar 26 and prevents the user from applying the follower member 3l to the cylindrical stud 34 in an inverted position. The pivot-pin 38 has a head 38' which projects into the space between the U of the U- shaped follower member and prevents accidental application of the latter upon the stud in a position 90 from the correct position. Working in strict parallelism with the seg mental yarn-laying member 21 is a loop-detaining finger 40 having a loop-taking point 4H and an inclined portion 42 immediately above such point. The finger M] is carried by an arm 43 which crosses over the bow of the segmental member 21 and has an upward extension 44 which is formed at its upper end with a hook 45 havin the opposed walls 45' engage opposite sides of the cross-bar 25 of the yarn-laying member. 21. When the walls 45 of the hook 45 engage the cross-bar 26, the loop-detaining'finger 40 is positively locked against displacement laterally of the plane of the bow 21 of the yarn-laying member and this causes the point 4| of the loopdetaining finger to descend in a fixed position relative to the bow 2! irrespective of wear on the pivots 23 and 48. The point M of the loopdetaining finger is received in the opening l5 in the guard-flange M.

The arm 43 is adjustably fastened by the screwand-slot expedient 46 to the carrier-arm 4'! which is fulcrumed at 48 upon the lateral extension 9' of the post 9. Thus the loop-detaining finger may be adjusted laterally of the line of seamformation to secure a desired loop-length in the product, within the limits provided. The loop-'- detaining finger is biased downwardly byrthe spring 49 which is coiled about and anchored to the pivot-stud 48 and has a hooked end engaging the carrier-arm 41. The arm carrying the loop-detaining finger 40 is provided with a finger-piece 53 for the convenience of the operator in manually disengaging the loop-detaining finger 40 from the last yarnloop preparatory to removing the work.

In the operation of the device, starting with the partsin the position shown in Fig. 1, as the needle I descends, the yarn-laying member 21 moves toward the left, and a base loop 5!, of yarn, Fig. 7, is formed back of themember'fl, which loop is entered by the needle. As the yarn-laying member continues its motion to the left, the base loop 5| is tightened about the needle and the finger 40 is withdrawn from the previously formed tip-loop 52, Fig. 7. When the motion of the yarn-laying member is reversed by the rise of the needle-bar, anew tip-loop 53,

Fig. 8, is formed and such loop is entered by the descending finger 40. 1 As this action is repeated the base loops 5| are sewn to the fabric base 54 by theline ofstitches 55. The bases of the loops of the previously stitched row are guided by the edge-guide 2l and pass under the guard-flange [4 of the tread member l2 which protects such previously stitched loops from being caught by The feed-dog 5 works in conjunction with the bottom surface l3 of the tread-member to feed the work; the stitchlength being adjusted by the usual feed-regulator .(not shown) to suit the thickness of the yarn and to effect the desired spacing of the loops in the row.

,It will be noted in Fig. 3 that the tip-loop153 which is caught by the loop-detaining finger 4! lies around the inclined shank portion 42 of such finger and, instead of lying horizontally, is twisted out of a horizontal plane so as to stand at an angle to the horizontal. This results in an even overlapping or nesting of the loops in the row, like the kernels in an ear of corn, which loops are made with a high degree of uniformity resulting in an attractive product. The light tension applied to the yarn by the spring 29 also contributes to the uniform character of the loops in the finished product, each loop being tensioned to the same degree in the process of its formation.

. While I have shown and described in detail one embodiment of the invention, it is to be understood that the invention is not limited to details of the construction and relative arrangements of parts shown and described, as various modifica- 1. In a rug-making attachment, a foot having an attaching shank and a horizontal work-engaging face, a segmental yarn-laying member pivotally carried by said foot for movement transversely of said foot in a vertical plane, and a loopdetaining finger fulcrumed on said foot to move up and down about an axis parallel to the pivotal axis of said yarn-laying member. V

2. In a rug-making attachment, a foot having an attaching shank and a'horizontal work-en: gaging face, a segmental yarn-laying member pivo-tally carried by said foot for'movement transversely of said foot in a vertical plane, a loopdetaining finger fulcrumed on said foot to. move up and down about an axis parallel to the pivotal axis of said yarn-laying member, and. an actuating connection between said yarn-laying member and said finger. V

3. In a rug-making attachment, a foot having an attaching shank and 'a horizontal work-engaging face, a segmental yarn laying member pivotally carried by said foot for movement transversely of said'foot in a vertical'plane, a loop detaining finger fulcrumed on said foot to move up and down about an axis parallel to the pivotal axis of said yarn-laying member, an actuating connection between said yarn-laying member and said finger, and means for interlocking said finger H and yarn-laying member against relative displacement transversely of their planes of oscillation. a

. 4. In a yam-loop sewing attachment, a foot having an attaching shank and a tread member formed with a work-engaging face and a raised guard-flange at one side of said face to clear the base portions of a previously stitched row of yarnloops, and an oscillatory yarn-loop-forming member and a loop-detaining finger each pivotally carried by said foot. 7

. 5. In a yarn-loop sewing attachment, a foot adapted to engage the bases of the loops of the previously stitched row of yarn-loops.

6. In a yarn-loop sewing attachment, a foot having an attaching shank and a tread member formed with a work-engaging face and a raised guard-flange at one side of said face to clear the base portions of a previously stitched row of yarn-loops, an oscillatory yarn-loop-forming member and a loop-detaining finger each pivotally carried by said foot, and an edge-guide adapted. to engage the bases of the loops of the previously stitched row of yarn-loops, said edge-guide being mounted on said foot for adjustment laterally of the line of seam formation.

7. The combination with a reciprocatory needle, and a feeddog, of a presser-foot opposed to said feed-dog, a yarn-laying member carried by said foot and movable laterally of the line of feed, a loop-detaining finger carried by said foot and movable up and down in a path at one side of said needle and close to said yarn-laying member, and a yarn-tensioning spring carried by said yarn-laying member.

8. The combination with a reciprocatory needle, and a feed-dog, of a presser-foot opposed to said feed-dog, a yarn-laying member carried by said foot and movable laterally of the line of feed, a loop-detaining finger carried by said foot and movable up and down in a path at one side of said needle and close to said yarn-laying member, a yarn-tensioning leaf-spring carried by said yarn-laying member, and a screw for adjusting the tension of said spring.

9. A rug-making attachment comprising a foot having an attaching shank at its rearward end and a post at its forward end, said post having a lateral extension, a segmental yarn-laying member pivotally mounted on said post, and a loopdetaining member pivotally mounted on said lateral extension, the pivotal axis of said members being parallel.

10. A rug-making attachment comprising a foot having an attaching shank at its rearward end and a post at its forward end, said post having a lateral extension, a segmental yarnlaying member pivotally mounted on said post, a loop-detaining member pivotally mounted on said lateral extension, the pivotal axis of said members being parallel, and means whereby said loop-detaining member may be adjusted toward or away from its pivotal axis.

11. The combination with a presser-bar, a reciprocatory needle-bar, and needle, of a needleclamp formed with a horizontally elongated head, a foot carried by said presser-bar, a segmental yarn-laying member pivotally carried by said foot, a follower pivotally carried by said yarnlaying member and embracing the head of said needle-clamp, and a loop-detaining member pivotally carried by said foot and actuated in one direction by said yarn-laying member.

12. A rug-making attachment for sewing machines comprising a foot having an attaching shank, a yarn-laying member pivotally carried by said foot and having a rearwardly disposed face, and a loop-detaining finger mounted on said foot for up-and-down movement in a plane closely in rear of the face of said yarn-laying member, said finger having a loop-entering point and an upwardly and rearwardly inclined shank-portion immediately above said point.

13. A rug-making attachment for sewing machines comprising a foot having an attaching shank and a tread member formed with a rearwardly opening stitch-receiving slot, said tread member having a lower work-engaging face and a guard-flange at one side of said stitch-receiving slot and above the plane of said work-engaging face, an oscillatory yarn-laying member carried by said foot and movable transversely of and above said tread member, and a loopdetaining finger movable up-and-down above said guard-flange and in rear of said yarn-laying member.

14. A rug-making attachment for sewing machines comprising a foot having an attaching shank and a tread member formed with a rearwardly opening stitch-receiving slot, said tread member having a lower work-engaging face and a guard-flange at one side of said stitch-receiving slot and above the plane of said work-engaging face, an oscillatory yarn-laying member carried by said foot and movable transversely of and above said tread member, and a loop-detaining finger movable up-and-down above said guard-flange and in rear of said yarn-laying member, said guard-flange having an opening to receive the point of said loop-detaining finger.

JOHN D. KARLE. 

